[Amps] Inexpensive variable air cap for amps

["Hsu" <Jbenson@sohu.com>]

Hi, 
 I just purchase some teflon film,the price not too expensive($30/kg). I think 
I can insert it into low volt/small volum variable air cap as high volt plate 
tuning cap, I think teflon film  with larger ? than air, the cap should be 
smaller ,even we can use a  cheap receiver tuning cap as amp's plate cap if it 
can hold enough RF current. does anyone have this  experience?
                        73! Hsu
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